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Question

State which of the following are surds. Justify.

(i) 73

(ii) 0.164

(iii) 83

(iv) -5

(v) 115

(vi) 0.333

(vii) 576

(viii) 54

(ix) 227

(x) 2+93

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Solution

an is a surd if 'n' is a natural numbern1 and 'a' is a positive rational number.

(i) 73: Here, 3 is a natural number and 7 is a positive rational number.Hence, it is a surd.

(ii) 0.164: Here, 4 is a natural number and 0.16 is a positive rational number.Hence, it is a surd.

(iii)
83=8686: Here, 6 is a natural number and 8 is a positive rational number.Hence, it is a surd.

(iv) -5 : Here, -5 is not a positive rational number.Hence, it is not a surd.

(v)

115=115 Here, 2 is a natural number and 115 is a positive rational number.Hence, it is a surd.

(vi)

0.333:Here, 2 is a natural number and 0.333 is a positive rational number.Hence, it is a surd.

(vii)

576 =24 is not an irrational number.Hence, it is not a surd.

(viii)

54: Here, 2 is a natural number and 54 is a positive rational number.Hence, it is a surd.

(ix)

227: Here, 2 is a natural number and 227 is a positive rational number.Hence, it is a surd.

(x)

2+93=2+33=5353 : Here 3 is a natural number and 5 is a positive rational number.Hence, it is a surd.

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